Curb



FIG. 1 is a first perspective view of a curb illustrating a first embodiment of my new design;

FIG. 2 is a second perspective view of the curb shown in FIG. 1;

FIG. 3 is a front elevation view thereof;

FIG. 4 is a top plan view thereof;

FIG. 5 is a bottom view thereof;

FIG. 6 is a right-side elevation view thereof; and,

FIG. 7 is a left-side elevation view thereof. 

The ornamental design for a curb, as shown and described. 